import random

#A function to simulate the roll of a die
#input: none
#output: random int between 1 and 6
def roll():
	return random.randint(1, 6)

#A function to prompt user for a name
#input: string "first" or "second" representing player number
#output: name
def getName(num):
	prompt = "Enter name of " + num + " player: "
	name = raw_input(prompt)
	return name

#A function to print "Let's play!"
#input: none
#output: none
def printStartMsg():
	print "Let's play!"

#A function to print "Thanks for playing!"
#input: none
#output: none
def printEndMsg():
	print "Thanks for playing!"

#A function to ask the user if he/she wants to play again
#input: none
#output: True if the user wants to play again, False otherwise
def playAgain():
	playagain = raw_input("Shall we play again? [y/n] ")
	if playagain == "y":
		return True
	else:
		return False

#A function to print the player name and value he/she rolled
#input: name, int value of the roll
#output: none
def printRoll(pname, rv):
	print pname + " you rolled a " + (str(rv))

#A function to determine the winner of the round
#input: value rolled by player 1 and value rolled by player 2
#output: 1 if player 1 won, 2 if player 2 won, 3 for tie
def determineWinner(p1val, p2val):
	if p1val > p2val:
		return 1
	elif p2val > p1val:
		return 2
	else:
		return 0

#A function to print a "congrats" message for the winner of the round.
#input: int representing the winner (1, 2, or 3 for tie), player 1 name, player 2 name
#output:none
def printWinner(winner, p1name, p2name):
	if winner == 1:
		print "Congrats " + p1name + "!  You are the winner!"
	elif winner == 2:
		print "Congrats " + p2name + "!  You are the winner!"
	else:
		print "It's a tie!"


#A function containing the main logic of game play
#input: player 1 name and player 2 name
#output: none
#Algorithm:
#print start message
#ask if user wants to play again
#while the user wants to play again
#  roll for player 1
#  print player 1's roll
#  roll for player 2
#  print player 2's roll
#  determine the winner
#  print a message for the winner
#  ask if user wants to play again
def play(p1name, p2name):
	printStartMsg()
	pa = playAgain()	
	while pa == True:		
		p1rollValue = roll()
		printRoll(p1name, p1rollValue)

		p2rollValue = roll()
		printRoll(p2name, p2rollValue)

		winner = determineWinner(p1rollValue, p2rollValue)
		printWinner(winner, p1name, p2name)

		pa = playAgain()		
	printEndMsg()

#main logic to begin game
#ask for names
#call play function
player1name = getName("first")
player2name = getName("second")
play(player1name, player2name)